Slub catching shuttle



NOV. 28, 1933. w STIMPSQN 1,937,072

SLUB CATCHING SHUTTLE Filed May 16. 1953 W/ TNES 5. INVENTOR. CL INTONJ. COBUE/Y. h ALLACE J77/7F60/V.

ATTORNEY.

Patented Nov. 28, 1933 1,937,072 V I SLUB CATCHING SHUTTLE Wallace 1. S timpson, Hopedale, Mass., assignor to Draper Corporation, Hopedale,

ration of Maine Mass.,- a corpo- I Application May 16, 1 93s. {SerialNd 671,357

5 Claims. (01 139-212) a The present invention pertains to loom shuttles and more particularly relates to filling car-v rying'shuttleshaving a slub catching device embodied. therein. I

It is not uncommon to provide the conventional filling carrying shuttle, either of the automaticallyqthreading or hand threading type, with a so-called slub catching device, which usually consists of. anarrow slot through which the running filling passes before it emerges from the eye of the shuttle. The slot is narrow, relative to the diameter of filling beingused, and is intended to prevent the passage of imperfections suchlas thick places in the filling thread, impurities caught in the thread, bunches of lint, or knots or snarled places occasioned by the filling sloughing off the filling carrier. If such imperfections are of a size intended to be held by the slub catcher, and are actually so held, the filling will be broken, thus causing loom stoppage, and preventing the weaving of the imperfections into the cloth.

While an open ended slot is, insofar as I am aware, the simplest and most effective form of slub catcher heretofore devised such arrangement has not proven entirely satisfactory in that it frequently fails to stop even very large imperfections in the filling and permits them to bewoven into the cloth. -'I have found that this failure of operation is due to the factthat when a large imperfection approaches the slub catching slot the filling, together with the imperfection, movelaterally out of the open end of the slot, which permits the imperfection. to pass on through the shuttle eye and to the cloth. Whether the action of the filling in thus unthreading from the slot is due to centrifugal force occasioned by the swirling or ballooning of the filling as it unwinds from the'filling .carrier, or is due to a camming contact between the imper- Ifection and the floor or wall of the thread passage, I am not prepared to say. However, I have definitely demonstrated that such unthreading does occur, and it'is the object of my invention to provide a slub catcher in the form of a narrow slot, together with means for preventing the filling from unthreading from the slot when a slub, or other imperfection, approaches the slot.

To this end the invention consists'in a filling carrying shuttle having a slub catcher comprised of a narrow slot and a thread entrance to the slot substantially vertically in a wall in the threading block which intersects the path of the running filling, and the thread entrance is constituted by a tapered indentation in the -wall at or adjacent the closed end of the. slot, although both the slot-and-the thread 'entrancemay be otherwise constituted.

' For detailed disclosure of the preferred embodiment of my invention reference maybe hadv to the accompanying drawing, of which: I Fig. 1 is a fragmentary plan view. of the'eye end of a shuttle embodying my invention;

' Fig.2 is a vertical sectional view-taken approximately on line 2"-2 of Fig. 3; I

Fig. 3 is an end elevation of .the threading block of Fig. l removed from the shuttle body, Figs. 2 and 3 being to an enlarged scale; and

Fig. 4 is a view similar to Fig. 2 but'showing theaction of the. slub catcher as the filling" passes therethrough. 1

The shuttle shown on the drawing is comprised of the usual Wooden body' 1 having a cavity 2 therein within which is received abobbin 3 or other filling carrier. This shuttle is of the automatically threading type, and is accordingly pro vided with a thread block 4 and a side delivery eye 5.

The threading block 4 is comprised of a floor 6,

front and rear Walls, '7 and'S respectively, a horn 9 projecting rearwardly and outwardly fromthe front wall '7, and a threading scroll 10; The fioor 6 inclines upwardly toward the outer end of the threading block, and this floor, together with the walls 7 and'8, form a thread passage which ex- I tends longitudinally of the shuttle and through which passage the filling ,7 passes before it passes beneath the depending prongll and out the eye 5.

A wall 12 extends upwardly from the floor 6 i at the outer end of the thread passage and this intersectsand isfintersected by the pathfof the running filling. As shown, the wall is approximately vertical, and is formed integrallywith the floor and walls of the threading block. The slub catcher, to which my invention more particularly pertains, is conveniently constituted by a narrow slot 13 extending downwardly from the top of the wall 12. I

The slot 13 is open at the top and extends downwardly and slightly forwardly toward the side eye, in order that the open end thereof may be properly positioned to receive the filling during the threading up process and the bottom, closed end of the slot, where the filling normally runs, is closer to the thread guide passage (not shown) formed on the under side of prong 11.

This slub catching slot should be very narrow; in fact, it should not be appreciably wider than the' thickness of the filling to be used in the shuttle.

interfere with the free passage of the filling as 7 Such a construction will not materially it ispayed out from the shuttle, but no slub, knot, or other imperfection substantially larger than the filling can pass through the slot. Accordingly, if the filling can be made to remain-in the slot whensuch an imperfection reaches the. wall 12 the filling will be broken, and the loom will be stopped in the usual manner, thus permitting the imperfection to be removed rather than move into. the cloth. l

However, as above noted, a simple slot, 'with-' out more, cannot'be depended upon to perform the desired function as the occurrence of an imperfection frequently results in the filling moving laterally (upwardly) out of the slot, which permits the imperfection to pass on out the side eye.

,I have discovered that the filling can be pre-..'

7 vented from becoming unthreaded from, the slot.

' the fillingagainst movement along the slot once the imperfection has entered thesame.

The form of thread entrance whichl preferis constituted by an indentation l i in the Wall 12 adjacent the closed'end of the, slot 13 and intersected by the. latter. Theindentation'shown is; of circular outline, approximately twice as wide as the slot,-and tapered to the widthof the. slot in'the direction of movement of the filling. Such an indentation may be made with a conventional counter-sink drill, the, indentation being formed before the slot 13 issawedor milledin the wall 12. The action ofthe indentation in preventing the fillingfrom rising in the slot is illustrated in Fig. 4, wherein the enlargement S is enteredinto theindentation and held. thereby against: risin up in the slot.

The point of emergence of the filling from the. slot. may be indented, as at 15, if so desired, this indentation serving merely to round the corners ofthe:slot to'prevent chafing of the filling. 1

I Having fully disclosed the preferred embodiment of my invention, Ilclaim: l

1. A .filling carrying shuttle having a. slub catcher comprised of a narrow open ended slot extending transversely of the path of the filling therethrough, there being a thread entrance to said slot adjacent the closed end only of the latter, which entrance is substantially larger than the said slot, and constitutes means engaging slubs in the, filling to prevent the filling from,

moving laterally out of the slot.

2. A filling carrying shuttle having a slub catcher comprised of a narrow open ended slot extending transversely of the path of the filling therethrough, there being a tapered thread'entrance to. said slot adjacent the closed end only of the latter which tapered entrance constitutes means in which slubs-in the filling become wedged, to preventzthefillingifrom moving laterally out of said slot. 7

3-."Afill-ing'carrying shuttle having a wall intersecting the path of the running filling as the latter is payed out from the shuttle, said wall being provided withca relatively narrow slub catching slot through which the running. filling:

normally-passes, there; being 'a' threadeentrance .7

to said slot, which entrance is comprised of a tapered indentation or"- substantially circular. out.-

line: formed in the saidi wall adjacent the closed' end of ,thesaid' slot and. intersectedb'y the latter.

, 4..Aniautomaticallythreading shuttle having a threading. block: and a. side .zdeliveryr eye,-. said threading block having a longitudinally extending threadpassage and a wall extending upwardly from the-floor thereof, said wallbeingvprovid'edi with a' relatively narrow slub catching. slot extending downwardly from the top thereof and). through which :slot: the running, filling normally passes, thereheing a thread entrance to said slot, which entrance is comprised of.a-relativ ely wide indentation formedinsaid .wall' adjacent; thelower; end'only ofthe said slot and intersected proyidedwith afrelatively narrow slub catching 'slot extending downwardly from the top'theree' of I and-through. which slot .the running filling normally passes, there being a thread entrance to. said slot, which-entrance is comprisedyoiia:

tapered indentation of substantially circularlouihline-formed, in-said-iwall adjacent the lower end'iof v WALLACE; r. sTIMPso f 

